dolphin/Source/DSPSpy/tests/op_test.ds

; This test tries to figure out a couple of unknown opcodes.
incdir  "tests"
include "dsp_base.inc"

// 0x02ca is an unknown opcode found in Zelda ucodes.

// 0x02ca logically shifts (not rotates) the whole ACC0 right by signed 16-bit value AC1.M
// (So, if AC1.M is negative, it shifts left).
// We'll call it  lsrn, no arguments.
// 0x02cb is the same opcode, but arithmetic.
// We'll call it  asrn, no arguments.

clr $ACC0
clr $ACC1
lri $AC0.H, #0
lri $AC0.M, #256
//neg $ACC0
lri $AC0.L, #1
lri $AC1.H, #0xFF
lri $AC1.M, #1
lri $AC1.L, #0xFF

call send_back

cw 0x02ca

call send_back

cw 0x02ca

call send_back

cw 0x02ca

call send_back

cw 0x02ca

call send_back

jmp end_of_test